luci-go/common/dirwalk: Code for walking a directory tree efficiently

common/dirwalk/tests/tools/walkdir/walkers_read.go

Index: common/dirwalk/tests/tools/walkdir/walkers_read.go
diff --git a/common/dirwalk/tests/tools/walkdir/walkers_read.go b/common/dirwalk/tests/tools/walkdir/walkers_read.go
new file mode 100644
index 0000000000000000000000000000000000000000..c67dd29ee3d5ae4a3d5b02142f3bc1754ecc08ce
--- /dev/null
+++ b/common/dirwalk/tests/tools/walkdir/walkers_read.go
@@ -0,0 +1,26 @@
+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package main
+
+import (
+	"io/ioutil"
+)
+
+// ReadWalker implements Walker. It reads the contents of each found file.
+type ReadWalker struct {
+	BaseWalker
+}
+
+func (r *ReadWalker) SmallFile(filename string, alldata []byte) {
+	r.BaseWalker.SmallFile(filename, alldata)
+}
+
+func (r *ReadWalker) LargeFile(filename string) {
+	r.BaseWalker.LargeFile(filename)
+	_, err := ioutil.ReadFile(filename)
+	if err != nil {
+		r.Error(filename, err)
+	}
+}